Mixing plant



Feb. 13, 1940'. H. vc`. PoLLrrz MIXING PLANT Filed March 14, 1938 5Sheets-Sheet 1 RNEY Feb. 13, 1940.A H. c. PoLLlTz MIXING PLANT 5sheets-sneek 2 Filed March 14, 1938 (NVENTOR. HAROLD C. POLL/22? BY, g g

' ATTORNEY Feb. 13, 1940. Hjc. BQLLlTz 2,190,044

MIXING PLANT Filed March 14, 1938 5 Sheets-Sheet 3 v INVENTOR. /fA/'owc. Pou/TZ ATTORNEY Feb. 13, 1940.' H. c. PoLmz MIXING PLANT Filed March14, 1.938

5 Sheets-Sheet 4 Feb. 13, 1940. H, C, Pomz 2,190,044

MIXING PLANT Filed March 14, 1938 5 Sheets-Sheet 5 IN VEN TOR. HAROL CPOLL/TZ BY g j ATTORNEY Y Patented Feb. 13, 1940 UNITED STATES PATENToFFlcE MIXING PLANT Harold C. Pollitz, Cedar Rapids, Iowa, assigner toIowa Manufacturing Company, Cedar Rapids, Iowa, a corporation of iowaAppucaucnivrawh 14, issafseriai No. 195,345

' comms. (o1. 259-153) This invention relates to mixing plants and hasparticular relation to a method of and machine for mixing asphalt, tar,oil andthe like with crushed rock, gravel or other aggregate.

It is a general object of my invention to provide a machine for mixingmaterials with liquid and for proportioning the ne materialsQcoursematerials and liquid in any desired proportion.

It is another very important object of my invention to provide a rapidline-production mechanism for picking up, drying,'proportioning, mixing,and discharging materials in which the various devices for thesepurposes are so constructed,

aligned, mountedand integrated that they may i .to place.

It is another object of my invention to provide means for driving allthe various parts of a device of the above character from a common.power source.

Another object of my invention is to provide a `device which may bequickly set up and fdismantled and is highly portable.

It is another objectof my invention to pro` vide an extremely accuratemeans for measuring j the quantity ofdiiferent grades and sizes ofmaterials including liquids going into a mix, and for accuratelyproportioning the mix in any desired proportion'.

Other and further features and objects of the invention will be moreapparent to those skilled in the art upon a consideration of theaccompanying drawings and following specifications, wherein is disclosedan exemplary embodiment of the invention, with the understanding.however, that such changes may be made therein as fall Within the scopeof the. appended claims, without departing from the spirit of theinvention.

In said drawings: i

Figure 1 is a view in perspective illustrating a. device constructedaccording to a preferred embodiment of my invention as, it appears setup for use.

Figure 2 is a view in schematic diagram of the device shown in Figure 1.

Figure 3 is a view in perspective of the device shown in Figures 1 and 2as it appears when arranged for transportation from one scene ofoperation to another.

.Figure 4 is a partial view in perspective of a.

'site side of the machine, and illustrates the drives employed, and

Figure 'I is a fragmentary-view in perspective of the fuel oil pumpingmechanism for pumping fuel to the nozzles of the drier.

Referring now to the drawings, and more particularly to Figure 1,' allof the parts of the device are mounted on a common frame such as theframe indicated generally at III, this frame consisting of channelmembers Ilia and Ib, cranked at Ic to provide a pedestal at what may betermed the front or pick-up end of the device. This pedestal may besupported by means of a tractor and trailer and wheels I2, asillustrated in Figure 3, or by means of a bolster and suitable wheelsand a pulling and steering tongue (not shown).

'I'he rear or discharge end of the device may be supported by a pair ofoscillators or distributors on which wheels I3 are rotatably mounted.

The parts of the preferred device (Figures 1 and 2) consist of a pick-upor cold elevator 2l, a drier 3|, a hot" elevator II, a shaker screen 5I,a hopperand chute structure, indicated generally at 6I, an aggregatebatcher and weighing bucket indicated generally at 1I, a pugmillindicated generally at SI, and a'discharge conveyor indicated generallyat III, all of the parts of Vthe device being preferably driven by meansof a power plant indicated at ISI;`

The pick-up elevator y2l is of conventional type and has a belt orAendless chain l22 to which buckets 23 are secured. The chain issupported by sprocket traction wheel 26 and idler 24. The l'sprocket andidler are rotatably mounted on the cated at 29 and 30 and is sopositioned that the buckets, at their lowermost points, will pick upaggregate such as rock and the like, from the ground. The aggregatedischarged from the buckets at the top of theirl travel is thrown into achute 32 which leads into the drier drum 3|. A op gate (not shown) ispositioned in the chute 32 to prevent the escape of heat and dust fromthe drier.

The member 33 is a stack adapted to carry oi! the products of combustionand moisture from the drier drum 3|. The stack is hinged, as indicatedat 34, in order that it may be foldeddown, as shown in Figure 3, fortransportation from one point to another. The lowermost portion of theframe 21 of the pick-up elevator 2|, as indicated at 21a, may likewisebe folded up, as indicated in Figure 3, to permit a tractor truck tohaul the equipment.

The drier drum 3| is supported by heavy ring 36. These rings are adaptedto rotate on pairs of oppositely disposed anged wheels 31, and a spocketring 38 is provided in order to drive the drier drum, as will behereinafter more particularly explained. The drier drum 3| is providedwith paddles (not shown) on the interior thereof, for mixing ofmaterial, in accordance with the usual construction.

The aggregate, such as rock and the like, is discharged from the drierdrum through the discharge chute 39. The material within the drier drumis heated by means of oil burners the nozzles of which are indicated at40. Obviously the drier drum, being supported for rotation on aninclined axis, will slowly carry material through the drum and dischargeit from the discharge chute 39 into the hot 'elevator 4|, the materialbeing dried duringits passage through the drum. The mechanismindicatedgenerallyat 40a is a fuel oil pump and heater set for pumping the fueloil to the drier heater nozzle 40.

Aggregate discharged from the chute 39 into the elevator 4|, is carriedupwardly by the buckets A2 of the elevator and discharged down the'chute43 and into the screening device indicated at 5|. The elevator chain 44is supported on sprocket 46 and idler 45 which are rotatably mounted onthe frame 41. The upper portion of the frame 41, indicated at 41a, ispivotally engaged to the lower portion by the pivot 41h and may befolded down. as illustrated in Figure 3, for transportation of the unit.

Material discharged from the chute 43 is deposited on the upper screen52 of the shaker 5|. This upper screen has a large coarse mesh havinglarge openings equal in area to the area of the largest material to bereceived in the bins of the hopper.' It is constructed `of heavymaterials of large cross section and acts as a buffer screen forscreening out oversize aggregate and protecting the lower screens 53 and53a. The coar'ser4 or oversize material remains on the top of the uppervscreen 52, and the liner material falls through onto the lower screens53 and 53a. The screen 53a will pass the finest material and permit itto be discharged into the bin 33 of the hopper 6|. The coarse material,which will not pass through the screen 52, is discharged from the shakerthrough the discharge chute 54 onto the ground at the side of themachine. 'I'he coarse material, which has passed through the upperscreen 52 but Willnot pass through the screen 53a, travels over to thescreen 53 and passes down through this screen into the section 62 of bin6|. The shaker 5|, of conventiona construction, is driven by means of aneccentric mountedat 55, and this eccentric is driven by means of thebelt sheave |11.

The 'aggregate is deposited in the hopper 6|,

with the coarse material falling into the bin 62 and the iine materialinto the ,bin 63. The coarse material may be discharged from the hopperby opening the gate 64 and the nner material by means of opening thegate 65. These gates are controlled by levers 64a and 65a respectively.Material may be discharged from the chute 54 by opening the gate 54a.

The material discharged from the hopper 6| falls into the aggregatebatcher and Weighing hopper 1| and'is weighed by means of the scale 12,the linkage 12a, 12b and 12e, being employed for conveying theproportionate part of the load to the scale 12. Any overiiow of materialfrom the weighing hopper-1| is discharged down th overflow chute 10. l

The liquid, such as oil or the like, is discharged into the bucket 13from the supply line 13a. A pump 14 is provided and this pump is drivenby means of a sprocket 14a, as hereinafter more particularly described.The iiuidis furnished to the pump by means of the supply line 13b andthe surplus is by-passed to the storage or supply tank (not shown) bymeans of the return line 13e. The discharge of iluid into the bucket 13is controlledby means of thevalve 13d. The bucket 13 is supported onscale beam 15 which is operatively connected to the scale 15a, so thatthe weight of the oil or other liquid in the bucket may be. determined.

The discharge of oil from the bucket 13 is controlled by means of a gatevalve in the b'ottom of the bucket, the control handle and crank ofwhich are indicated at 16, and oil discharged ifrom this bucket fallsinto the oil spreader pan 13e which spreads and discharges the oil ontothe aggregate in the pugmill 9|, which aggregate iis the aggregatedischarged from the aggregate batcher 1| Vinto the pugmill. In weighingthe materials the gate 65 is opened and the fine aggregate allowed tofall into the weighing batcher 1| until a certain weight of material,

'as predetermined by the requirements for the mix, has been deposited inthe batcher, as indicated by the scale 12. Then coarse material is addedby opening the gate 64 until a certain greater weight value, alsopredetermined, has been reached. 1

When the weight of the aggregate has been properly determined in thismanner, a gate 11 in the bottom of the batcher is opened by means of thelever 11a and the mixed material is permitted to fall into the pugmill9|.

Asphalt, oil or the like, as desired, is permitted to flow into thebucket 13 until the Weight of the liquidin the bucket reaches a certainvalue, as vindicated by the'scale 15d. The supply valve 13d is thenclosed and the gate valve in the bottom of bucket 13 opened to permitthe liquid.

. to flow into the spreader pan 13e and pugmill 9|.

When the material falls into the pugmill 9| it is thoroughly mixed bymeans of paddles (not shown) within the mill. The materials are mixed inthe pugmill for a period of time determined by the specifications forthe mix. When the material has been thoroughly mixed by the pugmill,

chain ||4 from a sprocket ||5 on a cross shaft lindicated at H6, theconveyor being started and stopped by means of the clutch, indicated atH1, controlled by a lever ||1a.

A relatively large sprocket wheel ||8 is provided on one endof the headshaft of the conveyor opposite sprocket I|3 and this sprocket is drivenby means of the head shaft H9, from the sprocket ||3.- The sprocket ||8drives a sprocket chain |20 which in turn drives the sprocket |2|, andthis sprocket drives a cross shaft |22 located beneath the outer end ofthe belt H2. The cross shaft |22 is provided with rubber fabric strips|23, and these strips are rapidly rotated by the shaft so that thestrips strike the belt to shake and beat the belt to remove materialclinging to the return belt.

The drive for driving the mixing plant is illustrated to best advantagein Figure 2. The prime mover, such as the internal combustion lengineindicated at |3|, drives a pulley |32 from the crank shaft of the engineand this pulley drives a main drive pulley |33 through the agency of thebelt |34. This main drive pulley is mounted on a main drive shaft |33a.'Ihree sprockets `are mounted on the opposite end of this main driveshaft and one of the sprockets drives the loading or hot elevator 4| bymeans of the chain |35, sprocket |31, shaft |310., sprocket |38, chain|39, and final head shaft sprocket 46a..

Another of the sprockets on the main drive shaft drives the pick-up orcold elevator and the drier drum through the agency of chain |42,

-sprocket |4|, bevel gearing |43, and longitudinally-extending drierdrive shaft |44. The drier drive shaft |44 drives the pump 14 by meansof the sprocket |41, sprocket chain |46, and sprocket 14a.

The drier drum 3| is driven by means of .a heavy sprocket, indicatedat|5|, and the heavy chain |52, which drives the-sprocket ring 38. Thesprocket |5| is mounted on a short shaft |44a which slopes at the sameangle as the drier. A universal joint |44b is employed for driving theshaft |44a. from the shaft |44.

The .cold or pick-up elevator 2| is driven by means of the bevel gearing|53 on shaft |4441., which drives the sprocket |54 to drive a chain |56.The chain |55 drives a cross shaft |51 by means of the sprocket |58,which in turn drives a sprocket |59 to drive another sprocket ISI. Thesprocket |6| is mounted on the head shaft |52 which drives the pick-upelevator.

A sprocket |10.on the main drive shaft Illa drives the shaker 5| bymeans of the chain III, the sprocket |12 on counter shaft |15, theV-belt sheave |13, the V-belts |14, sheave |11, and

`shaft 55.

Stili another sprocket |55 on the main drive shaft |33@ drives one shaftof the pusmill by means of the chain |8| and sprocket |85. This shaft ofthe pugmill drives the other shaft of the pus'mill by means of the spurgears |52.

4A sprocket |43 on one of the Dusmill shafts drives the chain |54, whichin turn'drives the sprocket |86 which in turn drives the cross shaft H6,to drive the conveyor belt ||2.

It may readily be understood that I have provided an extremely compact,mobile, and efdcient plant for the mixing of material, such as rock,gravel, oil, asphalt and the like. The materials proceed in a straightline from where the unmixed materials are picked up to the point Wherethey are delivered to a truck or/ the like in the mixed condition.Gravity is employed in the drying and mixing operations and the entiremechanism is mounted on `asingle supporting frame. The plant is of highcapacity and yet may readily be moved about from one job to the other.

Although I have described a specific embodiment of my invention, it isapparent that modifications thereof may be made by those skilled in theart. Such modifications may be made without departing from the spiritand scope of my invention as set forth in the appended claims.

I claim as my invention: A

l. In a mixing plant including a shaker screen, batching and weighingmeans below the shaker screen, a. pug mill below the batching means,means for distributing liquid bitumen over the material being mixed inthe pug mill, and means for delivering material from the, pug milllocated with the receiving end thereof beneath the pug mill, all mountedin vertical relation, a drier drum, a cold elevator `in front of thedrier drum, a stack for the drier drum, and a hot elevator between thedischarge end of the drier drum and the shaker screen, the hot elevatorbeing foldable into the space Just to the rear and above the drier drum,the stack being foldable above the drier drum, and the cold elevatorbeing fold-- able upon itself so that the folded portion is in front ofthe permanently mounted portion.

2. In a mixing plant including a pick-up elevator, `a drier drum,a-stack, a hot elevator, a screen, a hopper, weighing and batchingmechanism, a. pugmill and delivery conveyer, means vfor rendering theplant portable comprising hinge means in the pick-up elevator forfolding the pick-up yelevator upwardly, hinge means in the stack forfolding it down over the drier drum, hinge means in the hot elevator forfolding it down,y the screen and delivery conveyer being detachable.

3.' In a mixing plant having a shakerscreen,

batching and weighing means, a. pug mill. and` bitumen distributingmeans, all mounted in vertical relation in a tower on a portablechassis, and having a drier drum, a stack for same, a cold elevator anda hot elevator, means for rendering the plant portable including meansfor removably mounting the shaker screen on the tower, means for hingingthe lower portion of the cold elevator upwardly, means for folding thestack downwardly and rearwardly above the drier drum, and means forfolding the hot elevator downwardly to the rear of and above the drierdrum and below the top of the tower.l Q

HAROLD C. POLLI'IZ.

